/* 
 * diBoaS Learning Platform Redesign CSS
 * Enterprise-grade interactive learning interface
 * 
 * Extends: ../assets/css/main.css
 * Target: Lighthouse 95+, WCAG 2.1 AA
 * Performance: Core Web Vitals optimized
 */

/* ===========================
   LEARNING PLATFORM LAYOUT
   =========================== */

.learn-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--neutral-50);
}

/* ===========================
   HEADER STYLES
   =========================== */

.learn-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--neutral-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  max-width: 100%;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex: 1;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.mobile-menu-btn:hover {
  background: var(--neutral-100);
}

.mobile-menu-btn .hamburger {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.learn-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
  transition: opacity 0.2s ease;
}

.learn-logo:hover {
  opacity: 0.8;
}

.logo-icon svg {
  display: block;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--text-primary);
}

.logo-sub {
  font-family: var(--font-primary);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--aqua-primary);
}

.breadcrumb-separator {
  color: var(--text-tertiary);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.learning-progress-indicator {
  position: relative;
}

.progress-circle {
  position: relative;
  width: 40px;
  height: 40px;
}

.progress-ring {
  transform: rotate(-90deg);
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--aqua-primary);
}

.streak-counter {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--warning-light);
  color: var(--warning-orange);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
}

.streak-icon {
  font-size: var(--text-base);
}

.theme-toggle {
  background: var(--neutral-50);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-base);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  border-color: var(--aqua-primary);
  color: var(--aqua-primary);
  background: var(--bg-primary);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, var(--aqua-primary), var(--aqua-dark));
  color: white;
  text-decoration: none;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: all 0.2s ease;
  border: none;
}

.cta-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* ===========================
   LEARNING DASHBOARD
   =========================== */

.learning-dashboard {
  display: grid;
  grid-template-columns: 360px 1fr;
  flex: 1;
  min-height: 0;
}

/* ===========================
   SIDEBAR STYLES
   =========================== */

.learning-sidebar {
  background: var(--bg-primary);
  border-right: 1px solid var(--neutral-200);
  overflow-y: auto;
  height: calc(100vh - 65px);
  position: sticky;
  top: 65px;
}

.sidebar-content {
  padding: var(--space-6);
}

.current-guide {
  background: linear-gradient(135deg, var(--aqua-background), rgba(255, 255, 255, 0.5));
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  border: 1px solid var(--aqua-light);
  position: relative;
  overflow: hidden;
}

.current-guide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--journey-progress);
  opacity: 0.02;
  z-index: 1;
}

.guide-avatar {
  position: relative;
  z-index: 2;
  margin: 0 auto var(--space-4);
  width: 60px;
  height: 60px;
  animation: gentle-float 3s ease-in-out infinite;
}

.guide-info {
  position: relative;
  z-index: 2;
  text-align: center;
}

.guide-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}

.guide-message {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0 0 var(--space-4);
  line-height: 1.5;
  font-style: italic;
}

.guide-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.level-indicator {
  background: var(--aqua-primary);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
}

.level-indicator.beginner {
  background: var(--success-green);
}

.level-indicator.intermediate {
  background: var(--warning-orange);
}

.level-indicator.advanced {
  background: var(--mystic-primary);
}

.level-progress {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-weight: 500;
}

.mascot-selector {
  margin-bottom: var(--space-8);
}

.selector-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-4);
}

.mascot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.mascot-option {
  background: var(--neutral-50);
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.mascot-option:hover {
  border-color: var(--neutral-300);
  background: var(--bg-primary);
}

.mascot-option.active {
  border-color: var(--aqua-primary);
  background: var(--aqua-background);
}

.mascot-emoji {
  font-size: var(--text-xl);
  line-height: 1;
}

.mascot-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.mascot-level {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.learning-nav {
  margin-top: var(--space-6);
}

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

.nav-section.locked {
  opacity: 0.6;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-4);
  padding: var(--space-3);
  background: var(--neutral-100);
  border-radius: var(--radius-base);
}

.section-icon {
  margin-right: var(--space-2);
}

.section-progress {
  font-size: var(--text-xs);
  background: var(--aqua-primary);
  color: white;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.lesson-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-item {
  margin-bottom: var(--space-2);
}

.lesson-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-base);
  text-decoration: none;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.lesson-link:hover {
  background: var(--neutral-50);
  color: var(--text-primary);
}

.lesson-link.active {
  background: var(--aqua-background);
  color: var(--aqua-dark);
  border-color: var(--aqua-primary);
  font-weight: 500;
}

.lesson-link.completed {
  color: var(--text-primary);
}

.lesson-link.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.lesson-status {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.status-icon.completed {
  background: var(--success-green);
  color: white;
}

.status-icon.in-progress {
  background: var(--warning-orange);
  color: white;
}

.status-icon.locked {
  background: var(--neutral-300);
  color: var(--neutral-600);
}

.lesson-content {
  flex: 1;
  min-width: 0;
}

.lesson-title {
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-1);
  display: block;
}

.lesson-duration {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.section-unlock {
  padding: var(--space-4);
  background: var(--neutral-100);
  border-radius: var(--radius-base);
  text-align: center;
}

.unlock-message {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0 0 var(--space-3);
  line-height: 1.4;
}

.unlock-progress {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.unlock-bar {
  height: 6px;
  background: var(--neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.unlock-fill {
  height: 100%;
  background: var(--aqua-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.unlock-text {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ===========================
   MAIN CONTENT STYLES
   =========================== */

.learning-content {
  overflow-y: auto;
  height: calc(100vh - 65px);
  background: var(--bg-primary);
}

.content-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.lesson-header {
  margin-bottom: var(--space-8);
}

.lesson-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.lesson-phase,
.lesson-type,
.lesson-difficulty {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.lesson-phase {
  background: var(--aqua-background);
  color: var(--aqua-dark);
}

.lesson-type {
  background: var(--verde-background);
  color: var(--verde-dark);
}

.lesson-difficulty {
  background: var(--success-light);
  color: var(--success-green);
}

.lesson-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-6);
  line-height: 1.1;
}

.lesson-intro {
  margin-bottom: var(--space-6);
}

.lesson-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin: 0 0 var(--space-6);
  line-height: 1.6;
}

.lesson-stats {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.stat-icon {
  font-size: var(--text-base);
}

.lesson-progress-bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.progress-track {
  flex: 1;
  height: 8px;
  background: var(--neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

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

.progress-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: max-content;
}

.aqua-guidance {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background: var(--aqua-background);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  border-left: 4px solid var(--aqua-primary);
}

.guidance-avatar {
  flex-shrink: 0;
  animation: gentle-float 4s ease-in-out infinite;
}

.guidance-message {
  flex: 1;
}

.guidance-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--aqua-dark);
  margin: 0 0 var(--space-2);
}

.guidance-text {
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  font-style: italic;
}

/* ===========================
   LEARNING MODULE STYLES
   =========================== */

.learning-module {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.module-section {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--neutral-200);
  box-shadow: var(--shadow-sm);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

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

/* Video Section */
.video-container {
  max-width: 800px;
  margin: 0 auto;
}

.video-player {
  position: relative;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.video-thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--neutral-800);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.7);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.play-button:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: translate(-50%, -50%) scale(1.1);
}

.video-duration {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.video-controls {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--neutral-50);
  border-radius: var(--radius-base);
}

.control-btn {
  background: var(--aqua-primary);
  color: white;
  border: none;
  border-radius: var(--radius-base);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  font-size: var(--text-sm);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.control-btn:hover {
  background: var(--aqua-dark);
}

.video-progress {
  flex: 1;
  height: 6px;
  background: var(--neutral-200);
  border-radius: var(--radius-full);
  cursor: pointer;
  overflow: hidden;
}

.video-progress .progress-fill {
  height: 100%;
  background: var(--aqua-primary);
  border-radius: var(--radius-full);
  transition: width 0.1s ease;
}

.time-display {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  min-width: max-content;
}

/* Simulation Section */
.simulation-container {
  max-width: 700px;
  margin: 0 auto;
}

.simulation-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.simulation-header h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}

.simulation-header p {
  color: var(--text-secondary);
  margin: 0;
}

.simulation-interface {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.asset-selector h4,
.purchase-form h4 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-4);
}

.asset-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
}

.asset-option {
  background: var(--neutral-50);
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.asset-option:hover {
  border-color: var(--neutral-300);
  background: var(--bg-primary);
}

.asset-option.active {
  border-color: var(--aqua-primary);
  background: var(--aqua-background);
}

.asset-icon {
  font-size: var(--text-2xl);
  font-weight: bold;
  color: var(--text-primary);
}

.asset-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.asset-name {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.asset-symbol {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.asset-price {
  font-size: var(--text-sm);
  color: var(--success-green);
  font-weight: 600;
  font-family: var(--font-mono);
}

.purchase-form {
  background: var(--neutral-50);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.amount-input {
  margin-bottom: var(--space-6);
}

.amount-input>input {
  width: 100%;
  font-size: var(--text-2xl);
  font-weight: 600;
  text-align: center;
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}

.amount-input>input:focus {
  outline: none;
  border-color: var(--aqua-primary);
  box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.1);
}

.currency-symbol {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-secondary);
  pointer-events: none;
}

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

.quick-amount {
  background: var(--neutral-200);
  border: none;
  border-radius: var(--radius-base);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.quick-amount:hover {
  background: var(--neutral-300);
  color: var(--text-primary);
}

.quick-amount.active {
  background: var(--aqua-primary);
  color: white;
}

.purchase-summary {
  background: var(--bg-primary);
  border-radius: var(--radius-base);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.summary-row.total {
  border-top: 1px solid var(--neutral-200);
  margin-top: var(--space-2);
  padding-top: var(--space-3);
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--text-lg);
}

.purchase-button {
  width: 100%;
  background: linear-gradient(135deg, var(--aqua-primary), var(--aqua-dark));
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.purchase-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Quiz Section */
.quiz-container {
  max-width: 600px;
  margin: 0 auto;
}

.quiz-question h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-6);
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.quiz-option {
  background: var(--neutral-50);
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-base);
  padding: var(--space-4);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

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

.quiz-option:has(input:checked) {
  border-color: var(--aqua-primary);
  background: var(--aqua-background);
}

.quiz-option input[type="radio"] {
  width: 20px;
  height: 20px;
  accent-color: var(--aqua-primary);
  margin: 0;
}

.option-text {
  flex: 1;
  font-size: var(--text-base);
  color: var(--text-primary);
  line-height: 1.4;
}

.quiz-submit {
  width: 100%;
  background: var(--aqua-primary);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-submit:hover {
  background: var(--aqua-dark);
}

.quiz-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.quiz-feedback {
  margin-top: var(--space-6);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  text-align: center;
}

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

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

.feedback-icon {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-2);
}

.feedback-correct h4 {
  color: var(--success-green);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: 0 0 var(--space-2);
}

.feedback-incorrect h4 {
  color: var(--error-red);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: 0 0 var(--space-2);
}

.feedback-correct p,
.feedback-incorrect p {
  margin: 0;
  line-height: 1.5;
}

/* Takeaways Section */
.takeaways-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
}

.takeaway-card {
  background: var(--neutral-50);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  border: 1px solid var(--neutral-200);
  transition: all 0.3s ease;
}

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

.takeaway-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

.takeaway-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}

.takeaway-card p {
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ===========================
   LESSON NAVIGATION
   =========================== */

.lesson-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--neutral-200);
  gap: var(--space-4);
}

.nav-button {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--neutral-50);
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-5);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: all 0.3s ease;
}

.nav-button:hover {
  border-color: var(--aqua-primary);
  background: var(--aqua-background);
  transform: translateY(-1px);
}

.nav-button.primary {
  background: linear-gradient(135deg, var(--aqua-primary), var(--aqua-dark));
  border-color: var(--aqua-primary);
  color: white;
}

.nav-button.primary:hover {
  background: linear-gradient(135deg, var(--aqua-dark), var(--aqua-primary));
  transform: translateY(-1px);
}

.nav-button.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.lesson-completion {
  display: flex;
  align-items: center;
}

.complete-lesson {
  background: var(--success-green);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.complete-lesson:hover {
  background: #388E3C;
  transform: translateY(-1px);
}

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

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

/* ===========================
   ACHIEVEMENT MODAL
   =========================== */

.achievement-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.achievement-modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
}

.modal-content {
  position: relative;
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 400px;
  width: 90vw;
  text-align: center;
  box-shadow: var(--shadow-xl);
  transform: scale(0.8);
  transition: transform 0.3s ease;
}

.achievement-modal.show .modal-content {
  transform: scale(1);
}

.achievement-animation {
  position: relative;
  margin-bottom: var(--space-6);
}

.achievement-icon {
  font-size: 4rem;
  animation: achievement-bounce 0.6s ease-out;
}

.achievement-sparkles {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
}

.sparkle {
  position: absolute;
  font-size: var(--text-lg);
  animation: sparkle-float 2s ease-in-out infinite;
}

.sparkle:nth-child(1) {
  top: 10%;
  left: 20%;
  animation-delay: 0s;
}

.sparkle:nth-child(2) {
  top: 20%;
  right: 15%;
  animation-delay: 0.3s;
}

.sparkle:nth-child(3) {
  bottom: 15%;
  left: 30%;
  animation-delay: 0.6s;
}

.achievement-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-3);
}

.achievement-description {
  color: var(--text-secondary);
  margin: 0 0 var(--space-6);
  line-height: 1.5;
}

.achievement-rewards {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.reward-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--neutral-100);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.reward-icon {
  font-size: var(--text-base);
}

.modal-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.continue-learning {
  background: linear-gradient(135deg, var(--aqua-primary), var(--aqua-dark));
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.continue-learning:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.share-achievement {
  background: var(--neutral-100);
  color: var(--text-primary);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.share-achievement:hover {
  background: var(--neutral-200);
}

/* ===========================
   LOADING STATES
   =========================== */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(5px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.loading-overlay.show {
  opacity: 1;
  visibility: visible;
}

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

.loading-spinner {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-4);
}

.spinner-animation {
  animation: spin 2s linear infinite;
}

.loading-text {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  font-style: italic;
  margin: 0;
}

/* ===========================
   ANIMATIONS
   =========================== */

@keyframes gentle-float {

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

  50% {
    transform: translateY(-6px) rotate(1deg);
  }
}

@keyframes achievement-bounce {
  0% {
    transform: scale(0);
  }

  50% {
    transform: scale(1.2);
  }

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

@keyframes sparkle-float {

  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
    opacity: 0.7;
  }

  50% {
    transform: translateY(-10px) rotate(180deg);
    opacity: 1;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */

@media (max-width: 1024px) {
  .learning-dashboard {
    grid-template-columns: 1fr;
  }

  .learning-sidebar {
    position: fixed;
    left: -100%;
    top: 65px;
    width: 360px;
    height: calc(100vh - 65px);
    transition: left 0.3s ease;
    z-index: 200;
    box-shadow: var(--shadow-xl);
  }

  .learning-sidebar.active {
    left: 0;
  }

  .sidebar-overlay {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 150;
  }

  .sidebar-overlay.active {
    display: block;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .breadcrumb {
    display: none;
  }

  .learning-content {
    height: auto;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: var(--space-3) var(--space-4);
  }

  .content-container {
    padding: var(--space-6) var(--space-4);
  }

  .lesson-title {
    font-size: var(--text-3xl);
  }

  .header-right {
    gap: var(--space-2);
  }

  .lesson-stats {
    gap: var(--space-4);
  }

  .aqua-guidance {
    flex-direction: column;
    text-align: center;
  }

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

  .takeaways-grid {
    grid-template-columns: 1fr;
  }

  .lesson-navigation {
    flex-direction: column;
    gap: var(--space-4);
  }

  .nav-button {
    width: 100%;
    justify-content: center;
  }

  .mascot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .modal-content {
    padding: var(--space-6);
  }

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

  .continue-learning,
  .share-achievement {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .header-right {
    gap: var(--space-2);
  }

  .learning-progress-indicator {
    display: none;
  }

  .lesson-meta {
    gap: var(--space-2);
  }

  .lesson-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .section-title {
    font-size: var(--text-lg);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .module-section {
    padding: var(--space-6);
  }

  .simulation-interface {
    gap: var(--space-4);
  }

  .purchase-form {
    padding: var(--space-4);
  }

  .amount-input>input {
    font-size: var(--text-xl);
  }

  .quick-amounts {
    gap: var(--space-1);
  }

  .quick-amount {
    padding: var(--space-1) var(--space-3);
  }
}

/* ===========================
   ACCESSIBILITY & UTILITIES
   =========================== */

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

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 8px;
  border-radius: 4px;
  text-decoration: none;
  z-index: 1000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 6px;
}

/* Focus styles */
.lesson-link:focus,
.mascot-option:focus,
.asset-option:focus,
.quick-amount:focus,
.quiz-option:focus,
.quiz-submit:focus,
.purchase-button:focus,
.complete-lesson:focus,
.nav-button:focus,
.continue-learning:focus,
.share-achievement:focus,
.control-btn:focus,
.play-button:focus {
  outline: 2px solid var(--aqua-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {

  .gentle-float,
  .spinner-animation,
  .achievement-bounce,
  .sparkle-float {
    animation: none;
  }

  .lesson-link,
  .mascot-option,
  .asset-option,
  .nav-button,
  .takeaway-card {
    transition: none;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --neutral-200: #000000;
    --text-secondary: #000000;
    --text-tertiary: #000000;
  }

  .lesson-link,
  .mascot-option,
  .asset-option,
  .module-section {
    border-width: 3px;
  }
}

/* Print styles */
@media print {

  .learn-header,
  .learning-sidebar,
  .lesson-navigation,
  .mobile-menu-btn,
  .theme-toggle,
  .cta-button,
  .achievement-modal,
  .loading-overlay {
    display: none;
  }

  .learning-dashboard {
    grid-template-columns: 1fr;
  }

  .learning-content {
    height: auto;
  }

  .content-container {
    padding: 0;
  }

  body {
    background: white;
    color: black;
  }

  .module-section,
  .takeaway-card {
    break-inside: avoid;
  }
}