/**
 * HAM Radio Learning Platform - Styles
 * Spaced Repetition Learning for Licence Preparation
 */

/* ============================================================================
   CSS Variables (Light Theme Default)
   ============================================================================ */

:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-error: #dc2626;
  --color-error-light: #fee2e2;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;

  /* Text */
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-text-muted: #9ca3af;

  /* Backgrounds */
  --color-bg: #ffffff;
  --color-bg-secondary: #f3f4f6;
  --color-bg-tertiary: #e5e7eb;

  /* Borders */
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;

  /* Mastery states */
  --color-learning: #f59e0b;
  --color-reviewing: #3b82f6;
  --color-mastered: #16a34a;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --line-height: 1.6;

  /* Borders */
  --border-radius: 6px;
  --border-radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* ============================================================================
   CSS Reset
   ============================================================================ */

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* ============================================================================
   Layout
   ============================================================================ */

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
  min-height: 56px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
  min-width: 0;
}

.header-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-center {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

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

.header-btn {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.header-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.header-btn .icon {
  font-size: 1.25rem;
}

.header-back {
  background: transparent;
}

.header-back:hover {
  background: rgba(255, 255, 255, 0.15);
}

.header-progress {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.header-timer {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: monospace;
}

#main-content {
  flex: 1;
  padding: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.app-footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-md);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
}

/* ============================================================================
   Loading State
   ============================================================================ */

.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  color: var(--color-text-light);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
}

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

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

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

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

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

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

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* Session Complete Actions */
.session-complete-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.session-complete-actions .btn {
  width: 100%;
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================================================
   Dashboard Home View
   ============================================================================ */

.dashboard-home {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 600px;
  margin: 0 auto;
}

/* Header Card with Streak */
.dashboard-header-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.streak-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.streak-emoji {
  font-size: 2.5rem;
}

.streak-info {
  display: flex;
  flex-direction: column;
}

.streak-count {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  line-height: 1;
}

.streak-label {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.header-stats {
  display: flex;
  gap: var(--spacing-lg);
}

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

.header-stat-value {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.header-stat-label {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

/* Progress Card */
.progress-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
}

.progress-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.progress-card-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.exam-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.exam-badge.start {
  background: var(--color-bg-secondary);
  color: var(--color-text-light);
}

.exam-badge.progress {
  background: #dbeafe;
  color: var(--color-reviewing);
}

.exam-badge.ready {
  background: var(--color-success);
  color: white;
}

.main-progress-bar {
  height: 12px;
  background: var(--color-bg-tertiary);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.main-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-success) 100%);
  border-radius: 6px;
  transition: width 0.5s ease;
}

.progress-details {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* Today Card */
.today-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
}

.today-card h3 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-lg);
}

.review-alert-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  background: var(--color-warning-light);
}

.review-alert-inline .review-count {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-warning);
}

.review-alert-inline .review-text {
  color: #92400e;
  font-weight: 500;
}

.review-alert-inline.urgent {
  background: var(--color-error-light);
  animation: pulse-urgent 2s infinite;
}

.review-alert-inline.urgent .review-count {
  color: var(--color-error);
}

.review-alert-inline.urgent .review-text {
  color: var(--color-error);
}

.review-alert-inline.done {
  background: var(--color-success-light);
}

.review-alert-inline.done .review-icon {
  font-size: var(--font-size-xl);
  color: var(--color-success);
}

.review-alert-inline.done .review-text {
  color: var(--color-success);
  font-weight: 500;
}

[data-theme="dark"] .review-alert-inline {
  background: #78350f;
}

[data-theme="dark"] .review-alert-inline .review-text {
  color: #fcd34d;
}

[data-theme="dark"] .review-alert-inline.done {
  background: #166534;
}

[data-theme="dark"] .review-alert-inline.urgent {
  background: #7f1d1d;
}

/* Resume Session Alert */
.resume-session-alert {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
  border: 2px solid var(--color-primary);
}

.resume-session-alert .resume-icon {
  font-size: var(--font-size-xl);
}

.resume-session-alert .resume-text {
  color: var(--color-primary);
  font-weight: 600;
}

[data-theme="dark"] .resume-session-alert {
  background: linear-gradient(135deg, #1e3a5f 0%, #312e81 100%);
  border-color: #60a5fa;
}

[data-theme="dark"] .resume-session-alert .resume-text {
  color: #93c5fd;
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.action-buttons .btn {
  width: 100%;
}

/* Sections Card */
.sections-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
}

.sections-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.sections-card-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  padding: 0;
}

.btn-link:hover {
  text-decoration: underline;
}

.sections-progress-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.section-progress-item {
  padding: var(--spacing-sm) 0;
}

.section-progress-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
}

.section-progress-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 70%;
}

.section-progress-percent {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-weight: 500;
}

.section-progress-bar {
  height: 6px;
  background: var(--color-bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.section-progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s ease;
}

.section-progress-fill.learning {
  background: var(--color-learning);
}

.section-progress-fill.reviewing {
  background: var(--color-reviewing);
}

.section-progress-fill.mastered {
  background: var(--color-mastered);
}

/* Tips Card */
.tips-card {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.tips-icon {
  font-size: 1.2em;
  flex-shrink: 0;
}

.tips-card p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: #1e40af;
}

[data-theme="dark"] .tips-card {
  background: #1e3a5f;
  border-color: #2563eb;
}

[data-theme="dark"] .tips-card p {
  color: #93c5fd;
}

/* Pulse Animation */
@keyframes pulse-urgent {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.01);
  }
}

/* Mobile Responsive for Dashboard */
@media (max-width: 480px) {
  .dashboard-header-card {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .streak-display {
    flex-direction: column;
  }

  .header-stats {
    width: 100%;
    justify-content: space-around;
  }

  .progress-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .progress-details {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .section-progress-name {
    max-width: 60%;
  }
}

/* ============================================================================
   Segment View (Content)
   ============================================================================ */

.segment-view {
  max-width: 700px;
  margin: 0 auto;
}

.segment-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.segment-progress {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.segment-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
}

.segment-content {
  line-height: 1.8;
}

.segment-content h2 {
  font-size: var(--font-size-xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.segment-content h3 {
  font-size: var(--font-size-lg);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.segment-content p {
  margin-bottom: var(--spacing-md);
}

.segment-content ul, .segment-content ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.segment-content li {
  margin-bottom: var(--spacing-xs);
}

.segment-content code {
  background: var(--color-bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

.segment-content pre {
  background: var(--color-bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

.segment-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-md);
}

.segment-content th, .segment-content td {
  border: 1px solid var(--color-border);
  padding: var(--spacing-sm);
  text-align: left;
}

.segment-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

/* Concept and Tip Boxes */
.segment-content .concept-box {
  background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
}

.segment-content .concept-box h4 {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--color-primary);
  font-size: var(--font-size-base);
}

.segment-content .exam-tip {
  background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
  border-left: 4px solid #f59e0b;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.segment-content .exam-tip h4 {
  margin: 0 0 var(--spacing-sm) 0;
  color: #b45309;
  font-size: var(--font-size-base);
}

.segment-content .exam-tip ul {
  margin-bottom: 0;
}

[data-theme="dark"] .segment-content .concept-box {
  background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
}

[data-theme="dark"] .segment-content .exam-tip {
  background: linear-gradient(135deg, #78350f 0%, #1c1917 100%);
}

.segment-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

/* ============================================================================
   Question View
   ============================================================================ */

.question-view {
  max-width: 600px;
  margin: 0 auto;
}

.question-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

/* Question Header */
.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.question-progress {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  background: var(--color-surface);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.question-segment {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

/* Question Type Badge */
.question-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.review-badge {
  background: #dbeafe;
  color: var(--color-reviewing);
}

.new-badge {
  background: var(--color-success-light);
  color: var(--color-success);
}

.seen-badge {
  background: #fef3c7;
  color: #92400e;
}

[data-theme="dark"] .review-badge {
  background: #1e3a5f;
}

[data-theme="dark"] .new-badge {
  background: #166534;
}

[data-theme="dark"] .seen-badge {
  background: #78350f;
  color: #fef3c7;
}

.question-prompt {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.question-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.option-btn {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  text-align: left;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  font-size: var(--font-size-base);
  min-height: 44px;
}

.option-btn:hover {
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.option-btn.selected {
  border-color: var(--color-primary);
  background: #eff6ff;
}

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

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

/* ============================================================================
   Feedback View
   ============================================================================ */

.feedback-card {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  margin-top: var(--spacing-md);
}

.feedback-correct {
  background: var(--color-success-light);
  border: 1px solid var(--color-success);
}

.feedback-incorrect {
  background: var(--color-error-light);
  border: 1px solid var(--color-error);
}

.feedback-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.feedback-correct .feedback-title {
  color: var(--color-success);
}

.feedback-incorrect .feedback-title {
  color: var(--color-error);
}

.feedback-explanation {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

/* ============================================================================
   Dashboard View
   ============================================================================ */

.dashboard-view {
  max-width: 800px;
  margin: 0 auto;
}

.dashboard-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.dashboard-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
}

.overall-progress {
  margin-bottom: var(--spacing-xl);
}

.progress-bar-container {
  background: var(--color-bg-tertiary);
  border-radius: var(--border-radius);
  height: 24px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.progress-bar {
  height: 100%;
  border-radius: var(--border-radius);
  transition: width 0.3s ease;
}

.progress-bar-learning {
  background: var(--color-learning);
}

.progress-bar-reviewing {
  background: var(--color-reviewing);
}

.progress-bar-mastered {
  background: var(--color-mastered);
}

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

.section-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
}

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

.section-title {
  font-weight: 600;
}

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

.expand-icon {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

.section-card-header {
  cursor: pointer;
}

.section-card-header:hover .expand-icon {
  color: var(--color-primary);
}

.segment-list {
  margin-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-sm);
}

.segment-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: background-color 0.15s ease;
}

.segment-item:hover {
  background: var(--color-surface);
}

.segment-item .segment-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
  cursor: pointer;
}

.segment-item.completed .segment-status {
  color: var(--color-success);
}

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

.segment-item .segment-title {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.btn-train {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 12px;
  opacity: 0.8;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.btn-train:hover {
  opacity: 1;
  transform: scale(1.1);
}

.mastery-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.mastery-learning {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.mastery-reviewing {
  background: #dbeafe;
  color: var(--color-reviewing);
}

.mastery-mastered {
  background: var(--color-success-light);
  color: var(--color-success);
}

.exam-ready-badge {
  display: inline-block;
  background: var(--color-success);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  margin-top: var(--spacing-md);
}

/* ============================================================================
   Navigation
   ============================================================================ */

/* ============================================================================
   Mobile Responsive
   ============================================================================ */

@media (max-width: 600px) {
  .app-header {
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 48px;
  }

  .header-title {
    font-size: var(--font-size-base);
  }

  .header-btn {
    width: 36px;
    height: 36px;
  }

  .header-progress,
  .header-timer {
    font-size: var(--font-size-xs);
    padding: 2px var(--spacing-xs);
  }

  #main-content {
    padding: var(--spacing-md);
  }

  .btn-large {
    width: 100%;
  }

  .home-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .segment-title {
    font-size: var(--font-size-xl);
  }

  .question-card {
    padding: var(--spacing-md);
  }

  .section-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
}

/* ============================================================================
   Dark Theme Support
   ============================================================================ */

[data-theme="dark"] {
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-success: #22c55e;
  --color-success-light: #166534;
  --color-error: #ef4444;
  --color-error-light: #7f1d1d;
  --color-warning: #f59e0b;
  --color-warning-light: #78350f;

  --color-text: #f3f4f6;
  --color-text-light: #9ca3af;
  --color-text-muted: #6b7280;

  --color-bg: #111827;
  --color-bg-secondary: #1f2937;
  --color-bg-tertiary: #374151;

  --color-border: #374151;
  --color-border-dark: #4b5563;

  --color-learning: #f59e0b;
  --color-reviewing: #60a5fa;
  --color-mastered: #22c55e;
}

[data-theme="dark"] .app-header {
  background: #1e3a5f;
}

[data-theme="dark"] .option-btn {
  background: var(--color-bg-secondary);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .option-btn:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-primary);
}

[data-theme="dark"] .option-btn.selected {
  background: #1e3a5f;
  border-color: var(--color-primary);
}

[data-theme="dark"] .feedback-correct {
  background: var(--color-success-light);
  border-color: var(--color-success);
}

[data-theme="dark"] .feedback-incorrect {
  background: var(--color-error-light);
  border-color: var(--color-error);
}

[data-theme="dark"] .mastery-reviewing {
  background: #1e3a5f;
}

/* ============================================================================
   Modal Styles
   ============================================================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
}

.modal {
  background: var(--color-bg);
  border-radius: var(--border-radius-lg);
  max-width: 400px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-light);
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-content {
  padding: var(--spacing-lg);
}

.settings-section {
  margin-bottom: var(--spacing-lg);
}

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

.settings-section h4 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
}

.settings-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.theme-toggle {
  display: flex;
  gap: var(--spacing-sm);
}

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

.settings-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ============================================================================
   Additional Button Styles
   ============================================================================ */

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

.btn-danger:hover {
  background: #b91c1c;
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  min-height: 32px;
}

/* ============================================================================
   Update Notification
   ============================================================================ */

.update-notification {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-md);
  z-index: 1001;
}

/* ============================================================================
   Exam Mode Card (Home)
   ============================================================================ */

.exam-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.exam-card-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.exam-card-icon {
  font-size: 2rem;
}

.exam-card-info h4 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-base);
}

.exam-card-info p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* ============================================================================
   Exam Start View
   ============================================================================ */

.exam-start-view {
  max-width: 500px;
  margin: 0 auto;
}

.exam-start-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
}

.exam-start-card h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

.exam-info {
  text-align: left;
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.exam-info p {
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.exam-info ul {
  margin: 0;
  padding-left: var(--spacing-lg);
}

.exam-info li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-light);
}

.exam-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.exam-options .btn {
  width: 100%;
}

/* ============================================================================
   Exam Question View
   ============================================================================ */

.exam-view {
  max-width: 600px;
  margin: 0 auto;
}

.exam-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

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

.exam-timer {
  font-size: var(--font-size-xl);
  font-weight: 700;
  font-family: monospace;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
}

.exam-timer.time-warning {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.exam-timer.time-critical {
  background: var(--color-error-light);
  color: var(--color-error);
  animation: pulse-timer 1s infinite;
}

@keyframes pulse-timer {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.exam-progress-bar {
  height: 6px;
  background: var(--color-bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

.exam-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.exam-question-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.exam-question-prompt {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.exam-question-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.exam-option {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  text-align: left;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s, transform 0.1s;
  font-size: var(--font-size-base);
}

.exam-option:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.exam-option.selected {
  border-color: var(--color-primary);
  background: #eff6ff;
  transform: scale(0.98);
}

.exam-option:disabled {
  cursor: default;
  opacity: 0.7;
}

/* ============================================================================
   Exam Results View
   ============================================================================ */

.exam-results-view {
  max-width: 600px;
  margin: 0 auto;
}

.exam-results-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.exam-results-header {
  padding: var(--spacing-xl);
  text-align: center;
}

.exam-results-header.passed {
  background: linear-gradient(135deg, var(--color-success) 0%, #15803d 100%);
  color: white;
}

.exam-results-header.failed {
  background: linear-gradient(135deg, var(--color-warning) 0%, #d97706 100%);
  color: white;
}

.exam-results-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.exam-results-header h2 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: var(--font-size-2xl);
}

.exam-results-subtitle {
  margin: 0;
  opacity: 0.9;
}

.exam-score-display {
  padding: var(--spacing-xl);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.exam-score-main {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.exam-score-value {
  color: var(--color-primary);
}

.exam-score-separator {
  color: var(--color-text-light);
  margin: 0 var(--spacing-xs);
}

.exam-score-total {
  color: var(--color-text-light);
}

.exam-score-percent {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

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

.exam-stats {
  display: flex;
  justify-content: space-around;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

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

.exam-stat-value {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.exam-stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.exam-review-section {
  padding: var(--spacing-lg);
}

.exam-review-section h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.exam-review-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 400px;
  overflow-y: auto;
}

.exam-review-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  background: var(--color-bg-secondary);
}

.exam-review-item.correct {
  border-left: 3px solid var(--color-success);
}

.exam-review-item.incorrect {
  border-left: 3px solid var(--color-error);
}

.exam-review-number {
  min-width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  border-radius: 50%;
  font-size: var(--font-size-sm);
  font-weight: 600;
  flex-shrink: 0;
}

.exam-review-content {
  flex: 1;
}

.exam-review-question {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xs);
}

.exam-review-explanation {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-style: italic;
}

.exam-review-icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.exam-review-item.correct .exam-review-icon {
  color: var(--color-success);
}

.exam-review-item.incorrect .exam-review-icon {
  color: var(--color-error);
}

.exam-results-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.exam-results-actions .btn {
  width: 100%;
}

/* Dark mode for exam */
[data-theme="dark"] .exam-option.selected {
  background: #1e3a5f;
}

[data-theme="dark"] .exam-timer.time-warning {
  background: #78350f;
}

[data-theme="dark"] .exam-timer.time-critical {
  background: #7f1d1d;
}

/* Mobile responsive for exam */
@media (max-width: 480px) {
  .exam-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .exam-score-main {
    font-size: 2.5rem;
  }

  .exam-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .exam-card {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }

  .exam-card-content {
    flex-direction: column;
  }
}

/* ============================================================================
   Statistics View
   ============================================================================ */

.statistics-view {
  max-width: 700px;
  margin: 0 auto;
}

.stats-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.stat-card-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-card-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

.stat-card-sub {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.chart-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.chart-card h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.activity-chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 120px;
  padding-bottom: var(--spacing-lg);
}

.activity-bar-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
}

.activity-bar {
  width: 100%;
  background: var(--color-primary);
  border-radius: 4px 4px 0 0;
  min-height: 2px;
  position: relative;
  transition: height 0.3s ease;
}

.activity-bar.today {
  background: var(--color-success);
}

.bar-value {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  color: var(--color-text-light);
  white-space: nowrap;
}

.bar-label {
  font-size: 9px;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
  text-transform: capitalize;
}

.accuracy-trend {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.trend-point {
  flex: 1;
  text-align: center;
  padding: var(--spacing-sm);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
}

.trend-value {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
}

.trend-date {
  font-size: 10px;
  color: var(--color-text-muted);
}

.empty-state {
  text-align: center;
  color: var(--color-text-light);
  padding: var(--spacing-lg);
  font-style: italic;
}

@media (max-width: 480px) {
  .stats-summary-grid {
    grid-template-columns: 1fr;
  }

  .activity-chart {
    height: 80px;
  }

  .accuracy-trend {
    flex-wrap: wrap;
  }

  .trend-point {
    min-width: calc(33% - var(--spacing-sm));
  }
}

/* ============================================================================
   Weak Areas Dashboard
   ============================================================================ */

.weak-areas-view {
  max-width: 700px;
  margin: 0 auto;
}

.weak-areas-section {
  margin-bottom: var(--spacing-xl);
}

.weak-areas-section h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.section-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.weak-sections-list,
.problem-cards-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.weak-section-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
}

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

.section-name {
  font-weight: 600;
  font-size: var(--font-size-base);
}

.mastery-percent.urgent {
  color: var(--color-warning);
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.progress-bar-container.small {
  height: 8px;
  margin-bottom: var(--spacing-sm);
}

.progress-bar-warning {
  background: var(--color-warning);
}

.weak-section-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.gap-badge {
  background: var(--color-error-light);
  color: var(--color-error);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.problem-card-item {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-left: 3px solid var(--color-warning);
  transition: all 0.2s ease;
}

.problem-card-item.clickable {
  cursor: pointer;
}

.problem-card-item.clickable:hover {
  background: var(--color-bg-tertiary);
  transform: translateX(4px);
  border-left-color: var(--color-primary);
}

.problem-card-action {
  display: flex;
  align-items: center;
  margin-left: var(--spacing-sm);
}

.practice-icon {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.problem-card-item.clickable:hover .practice-icon {
  color: var(--color-primary);
}

.problem-card-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.problem-card-topic {
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.problem-card-state {
  font-size: var(--font-size-sm);
  padding: 2px 6px;
  border-radius: 3px;
  display: inline-block;
  width: fit-content;
}

.problem-card-state.learning {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.problem-card-state.reviewing {
  background: #dbeafe;
  color: var(--color-reviewing);
}

.problem-card-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* Dark mode weak areas */
[data-theme="dark"] .gap-badge {
  background: #7f1d1d;
}

[data-theme="dark"] .problem-card-state.learning {
  background: #78350f;
}

[data-theme="dark"] .problem-card-state.reviewing {
  background: #1e3a5f;
}

[data-theme="dark"] .problem-card-item.clickable:hover {
  background: #374151;
}

[data-theme="dark"] .practice-icon {
  color: #6b7280;
}

[data-theme="dark"] .problem-card-item.clickable:hover .practice-icon {
  color: #60a5fa;
}

/* ============================================================================
   Formula Reference Modal
   ============================================================================ */

.formula-modal {
  max-width: 500px;
  max-height: 85vh;
}

.formula-content {
  max-height: 65vh;
  overflow-y: auto;
}

.formula-search {
  margin-bottom: var(--spacing-md);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  padding-bottom: var(--spacing-sm);
}

.formula-search input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.formula-search input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.formula-category {
  margin-bottom: var(--spacing-lg);
}

.formula-category-title {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-primary);
  font-weight: 600;
}

.formula-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.formula-item {
  background: var(--color-bg-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--color-primary);
}

.formula-name {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.formula-expression {
  font-family: 'Courier New', Consolas, monospace;
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  margin: var(--spacing-xs) 0;
  font-weight: 600;
}

.formula-variants {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-family: monospace;
  margin-top: var(--spacing-xs);
}

.formula-note {
  font-size: var(--font-size-sm);
  color: var(--color-warning);
  font-style: italic;
  margin-top: var(--spacing-xs);
}

.formula-unit {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

/* Dark mode formula adjustments */
[data-theme="dark"] .formula-search input {
  background: var(--color-bg-tertiary);
}

[data-theme="dark"] .formula-item {
  background: var(--color-bg-tertiary);
}

/* ============================================================================
   Notification Settings
   ============================================================================ */

.notification-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  transition: opacity 0.2s ease;
}

.setting-row.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.setting-row label {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  cursor: pointer;
}

.setting-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.setting-row input[type="time"] {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.setting-row input[type="time"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

.notification-status {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

/* Dark mode notification adjustments */
[data-theme="dark"] .setting-row {
  background: var(--color-bg-tertiary);
}

[data-theme="dark"] .setting-row input[type="time"] {
  background: var(--color-bg);
  border-color: var(--color-border);
}

/* ============================================================================
   Accessibility & Print
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media print {
  .app-header,
  .app-footer,
  .btn {
    display: none;
  }

  #main-content {
    max-width: 100%;
    padding: 0;
  }
}

/* ============================================================================
   Help View
   ============================================================================ */

.help-view {
  max-width: 800px;
  margin: 0 auto;
}

.help-content {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

.help-content h2 {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

.help-content h2:first-child {
  margin-top: 0;
}

.help-content h3 {
  font-size: var(--font-size-lg);
  margin: var(--spacing-md) 0 var(--spacing-sm) 0;
  color: var(--color-text);
}

.help-content p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.help-content ul,
.help-content ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.help-content li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.help-content strong {
  color: var(--color-text);
  font-weight: 600;
}

.help-content em {
  color: var(--color-text-light);
}

.help-content code {
  background: var(--color-bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-family: 'Courier New', Consolas, monospace;
}

.help-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-xl) 0;
}

.help-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.help-content th,
.help-content td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border: 1px solid var(--color-border);
}

.help-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.help-content tbody tr:hover {
  background: var(--color-surface);
}

.help-section {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.help-section h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.help-section ul:last-child,
.help-section ol:last-child,
.help-section p:last-child {
  margin-bottom: 0;
}

/* Dark mode help adjustments */
[data-theme="dark"] .help-content code {
  background: var(--color-bg-tertiary);
}

[data-theme="dark"] .help-section {
  background: var(--color-bg-tertiary);
}

[data-theme="dark"] .help-content th {
  background: var(--color-bg-tertiary);
}

/* Mobile responsive help */
@media (max-width: 600px) {
  .help-content {
    padding: var(--spacing-md);
  }

  .help-section {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .help-content table {
    font-size: var(--font-size-xs);
  }

  .help-content th,
  .help-content td {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}